OMRON Sysdrive 3G3HV - Detector Cooling Section

Motor Deceleration Is Too Slow
Deceleration Time is Too Long Even if Braking Resistor Unit is Connected
• Stall prevention during deceleration is selected with n070.
When the Braking Resistor Unit is connected, always set n070 to 0
(i.e., no stall prevention during deceleration). If n070 is set to 1, the
Braking Resistor Unit will not be used. The parameter n070 is set to 1
before shipping.
• The deceleration time set with n020 or n022 is too long.
Check the deceleration time setting.
• The motor torque is insufficient.
If the parameter settings are normal and overvoltage does not occur,
the motor capacity is insufficient.
The motor capacity should be increased.
Vertical-axis Load Drops When Brakes are Applied
• The sequence is incorrect.
The Inverter is default-set to remain in DC braking status for 0.5 s after
deceleration is complete. Modify the sequence so that brakes are applied
when the Inverter enters DC braking status or adjust with n065
the DC braking time.
• The DC control current is insufficient.
If the DC control current is insufficient, set a higher DC control current
with n064.
• Inappropriate brakes are used.
Always use control brakes, not holding brakes.
Motor Burns
• The load is excessive.
The motor will burn out if the load is excessive and the effective torque
of the motor exceeds the rated torque of the motor. The motor may
have permissible torque for a limited period, such as an eight-hour
rated torque. The motor will burn out if motor is operated with the eighthour
rated torque continuously for more than eight hours.
Reduce the load or the acceleration and deceleration time of the motor
or increase the motor capacity if the load is excessive.
• The ambient temperature is too high.
The motor will burn out if the motor is operated with its rated torque
continuously if the ambient temperature is higher than the permissible
ambient temperature of the motor. Always use the motor within the
permissible ambient temperature.
• The dielectric strength of each phase of the motor is insufficient.
Surge occurs between the switching circuit of the Inverter and the coils
of the motor if the output of the Inverter is connected to the motor. Normally,
the maximum surge voltage is approximately three times the
power voltage imposed on the Inverter (i.e., 600 V for the 200-V Inverter
and 1,200 V for the 400-V Inverter). Therefore, the dielectric
strength of each phase the motor to be used must be higher than the
maximum surge voltage.
Be sure to connect a dedicated motor to the 400-V Inverter.